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TIL that penicillin was formally discovered when Alexander Fleming did not tidy up some petri dishes filled with bacteria before going on vacation. A penicillin spore then spontaneously landed in a petri dish and caused enough damage to the bacteria for Fleming to notice this when he came back.

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R4ja TIL In 1972 Lyle Snider, a Quaker who didn’t want his tax dollars going to fund war, was arrested for claiming 3 billion dependents, the population of the Earth, on his W-4 form. Snider was charged with filing a false and fraudulent withholding form, and sentenced to 9 months in prison.
BgVvk TIL that Idaho is a made up word, not derived from the Shoshone language.
ep0an TIL: Concrete is the second-most-used substance on earth after water.
K7w6 TIL during kidney transplants, the bad kidneys are not usually removed. Instead, the new kidney is put into the pelvis.
b6gxj TIL BBC hoaxed audience with a fake spaghetti tree video on April Fool's Day in 1957